so i got around to min maxing my overclock settings today and i noticed that on 3 gpus that they put out 31.2 mh/s at +895 mem clock but at +900 they each drop to 28.7 mhs. Is this some sort of a throttling? i find it strange that they would drop so much at a hard limit while my 3 other gpus all crash before the +895 mark.